Machine for trimming abrasive wheels



Nov. 24, 1931. H. G. wl-:lNLAND ET AL MACHINE FOR TRIMMING ABRASIVEWHEELS Filed May 22, 1929 5 Sheets-Sheet l iN'v'ENTORS ATTORNEYS NOV-24, 1931- H. G. )NEINLAND ET AL. 1,833,657

MACHINE FOR TRIMMING ABRASIVE WHEELS Filed May 22, 1929 3 Sheets-Sheet 243 w ao 4/ Nov. l24, 1931. H. G. WEINLAND ET AL MACHINE FOR TRIMMINGABRASIVE WHEELS Filed May 22. 1929 3 Sheets-Sheet 3 0;, v INVENTORS ATRNEYS vPatentedv Nov. 24, 1931 ,l -UNETEDjgT-ras PATENT OFFICEv:Initiation e. wEINLAND-AND-Gnonenfn. vANoE, or SPRINGFIELD,omdnssmnons 'ro THE: SAFETY GRINDING WHEEL-almonmn COMPANY, orSPRINGFIELD, oiIIo, A

1 .CORPORAfTION- 0F OHIO MACHINE non TRIMMING ABRAsIvE WHEELSApplication iled May 22,

This invention relates to improvements in .macl'iines'for truing thefaces or'peripheries Vof abrasive grindingwheels. i

@ne of the objects of the invention 1s to providefor quickly andreadily'adjusting the position ofV the' cutting tool to allow thetfool'to' i'st cut in one direction acrossv the Working* face orperiphery ofthe grinding WheelY and' then in the other direction, thecuts being from the edges inwardly to obviate` danger ofchipping'thecorners or edges is' fixed sothat the tool'may be'readil'y positioned*at the' properangle- With relation to either' side ofthe Work Withoutthe necessity of adjusting' the slide-so vfar as 'securing' the desired'angleris concerned..

.Another object isrk to provide'power-operated I"mechanism andvcontrollin g means thereforforfthe'various-movements of the cuttingtoolfin'order to eliminate manuallabor and also obviate costlyymaintenance of screw feeds' due tothe necessity ofeliminatinglubricationin machines of this kind.

i Another objectv is; the provision of automatic `means for varying thelYspeed at which the grinding- Wheel is rotated to maintain aconstantperipheral speed for different sizes efe/heels mounted on-themachine forA trimming-.or truing purposes. .Av lfurther obiect is topro-vide for the secure clamping of the tool holding devices, togetherwith controlling `means for the actuation ofthe clamping devices. 1

Otherf objects vand advantages VWill appear from' thefollowingspecications and claims.

'In they accompanying drawings: Fig. l isa topI plan view.

' Eigiis an enlargedpartial front elevation kof the tool movement'controlling mechanisms.

1.929. Serial No. 365,183.

Fig. 3 isan enlarged sectional View on the line3-3 of Fig. 2'.

Fig. 4 is a side elevation of the machine.

' Fig. 5 is also a side elevation, viewed from the opposite ascomparedto Fig. 4.

Fig. 6 is a partial front elevation.

Fig. 7' is an enlarged fragmentary plan view 'of a portion of theyadjusting means.

Fig. 8y is an enlarged planv view, similar to Fig. 7', with the parts ina dilierent relation.

Fig. 9 isan enlarged sectional View of the tool holding devices.

The machine shown in the drawings and described in the specifications-isparticularly applicable to the operation of truing the working face orperiphery of an abrasive grinding Wheel, Where it is essential that theface be concentric with the bore and square with the sides of theyWheel, andl that the wheel have square, un-nicked corners or edges tomaintain the Wheel in proper balance.

Referring to the drawings, the grinding wheel 1, Whose face is to betrued, is mounted inthe usual manner on a spindle 2 and se"-cured'thereony With the nut 3. The spindlev 2 is carried in bearings(not shovvn) in a bearing support or supports 4V having capsl 5-Inountedon ama-in framecasting 6, supported on legs 7 and is yrotated by anysuitable manner in the direction of the-arrow on the Wheel l (see Fig.4) there being in this case a pulley 8 keyed to the spindle 2 yin thespace between the bearing supports 4.

The preferable toolemployed in'all such truingfoperations-is acone-shaped hardened steel member 9, formed byz stamping flatsheet'm'etal into the 4cone shape as shown and rigidly secured in oneend ofa hollow spindle 10; there being a bolt l1 having a conical shapedheadl 12 passed-through the' central opening 14 of the tool 9 andthrough the bore l5 vof the hollow` spindleV l() and havingr nut 13 bymeans of Whichthe" tool is'drawn' tightly into the cupped end 16 of thespindle (Fig- 9). The action of the tool or cutter 9 when pressedagainst arevolving grinding wheel is to break or cut away all portions 5of the wheel touched by the tool and to turnv member20 and a can 21 arebored vto receive' the shell 19, and when the shell is placed` in 'l5the bore .itis held rigidly by means of the screws 22. rlhe wear on thetool 9 is least, and the cutting action isV better performed when thetool is at an angle with the face of i the'wheel, as shown in Fig. 1,and since the cuts are taken from eachV edge inwardly toward the lcenterof the wheel face, it'follows that there are two preferred positions for.the

Y vtool and itsholder, shown in full and dotted lines in Fig. 1, whichposition must be accurately the same either side of the center of thearc offmovement. Accordingly, to locate the tool-holder in either lofthe two positions there'is a'plunger .23 slidably mounted in a recess24. in the boss 25, preferably an integralpart kof the block 2O andconnected therewith by arms 26, a spring 27 being` interposed betweenthe head 23 of the lplunv ger and the top of the recess. A hand lever 28having a'forked end is pivoted on a pin 129 journaled in a 'block 30,attached to the cap 21, by means of whichthe plunger may be 'liftedagainst thetension of ythe spring 27. -The tool-holder isv mounted atone end of a slide 3,1,with the center lines of the tool 9 and the'wheel spindle -2 coinciding, and for the purpose of obtaining an equalangle in either of the positions of the tool, there are two bushings 32set in the slide 31 which receive the head of the plunger 23 to positioni the tool; the bushings'being set yanequa-l distance on each side ofthe center line atright angles to theface of the wheel 1. Y Toprovide acentral point about which thetool-holdei.I may be turnedwhen-.shiftingvto keither of the d? two positions, there. is, on theunder side of the base 20, a. boss Y33, fitted in arecess 34m the slide31. v n v The slide -31 is supported on a saddle 35 andhas areciprocatory movement on the saddle parallel to the longitudinal axisof the spindle 2. Ashas been mentioned previously'-, the use oflubricants tends to present voily surfaces that catch and hold theabrasive dust. lt is therefore desirable to operate the G9 machine withthe minimum of lubrication,

involving excessive manual labor, and to obviate this, hydraulic poweris employed. On theslide'31 is mounted a cylinder 36 secured thereto byclamps 36, having the usual pis- 55 ton (not shown) andpiston rod`3Z,the' outer right, and vice-versa.

In order to quickly and securely clamp the tool-holder to the slide31there are provided means foraccomplishing this by hydraulic power,comprising a cylinder 39 attached to Y the slide, a beaml40-1'3ivotedon' apin 42 ina pair-of standards 41. The end'43 of thebeam is pivoted to a pin 44' carried by the aws of a clevis 45 threadedon the upper end of the piston rod 46 of the cylinder 39. When pressureis applied to the lower side of the pis ton in Ithe cylinderi'39, therewill be an upward movement of the end 43 .of-thebeam 40. and acorresponding downward movement of .the opposite end 47, and thuspressure may be applied to the tool-holder to rigidlyhold it, throughthemedium of afblock 48 resting on the cap 21. When itis .desired toshift the tool to'another position, the pressure is applied to the upperend of the cylinder, which will lift the beamend 47, and by means Vofthe lever 28 theplunger 23 may b e withdrawn from the locating bushing32, after which the entire tool-holder may be shifted 'to the oppositeposition', after beingy withdrawn from the wheel in the manner to belater explained. rlhe saddle 35 is carried on waysl 49 which areintegral parts of themain frame structure 6, the movement of thesaddlebeing also reciprocatory but in the direction to and from thespindle atright-angles thereto. Asis the casewith the slide 31, thesaddle 35 isalso reciprocated by hydraulic power, there being a cylinder 50, one endof which is secured to the frame 6, and having a piston 51, a rod 52 andother associated common parts'similar to the other cylinders. The rod 52eXtends forwardly towards the frontof the machine and is secured to thesaddle 35 by means of a block 53, there being a nut 54 at each end ofthe block 53 on the threaded, end of the rod 52. It' will be evidentfrom this that there fue will be a forward and rearward motion impartedto the saddle 35, and likewise to the tool 9, when pressure isalternatelyapplied Y to either end of the cylinder 5 0, by means ofwhich the tool approaches or is withdrawn from the wheel beingtrued.

The limit of travel of the saddle 35 is fined by stops 55 and 55 securedto the trame. However it is evident that the diameter of the wheel beingfaced is determined by the position of the tool 9, and in order 'toadjustably limit the movement of the saddle 35 to* ward the wheel 1,there is provided a screw 56 threaded in the'block 53, and journaled ina boSS 57 at the front end of the frame 6. u-

" toward atheist-ops ,orffuntiil=contact is made en,... are outer :snaiof; the www. 56 is .fixed .a

ffofithe saddlei3'5 toward'ithefspindleQ. 'llhereiffoife seen thatiwhenf'pressure is ap- Aspul'ied;to ithe 'endfmf :the cylinder-150, the

mevementiofsthe saddle l.35', and consequently ofy the tool 9, is toythe `front .of the matowardxthefstops, Vwhile when the pressureisimeversed, the saddle wvitl advance 59 and boss 57 one or more shim's,only one of which, 60, is shown in the present case, the function ofwhich is, when interposed, to stop the travel of the saddle'35, and whenremoved, to permit a further advancement of the saddle equal to itsthickness. For convenience in operation, the shim 60 is hinged on a lpin6l to the frame 6 in alignment with theboss 57, and has an open slot 62by means Y of which it may embrace the screw 56.

The control of the various movements of the slide 3l and saddle 35, andalso the clamping arrangement for the tool-holder, is accomplished bymeans of a-plurality of valves, 63, slidably fitted in a valve block 64,and actuated by levers 65. Fluid, preferably oil, under pressure, isconducted through a pipe 66 and through a series of drilled openings inthe valve block 64 to each end of each valve, another series of openings67 leading to connections 68 convey the fluid to the respective ends ofthe cylinders.` Each valve may be at rest in either of the positionssupplying pressure to a cylinder, at which time the series exhaustports-69, which are always in registry with the centers of the valves,will exhaust the opposite end of a cylinder under pressure. The exhaustports 69 connect with an opening 70 from a pipe 71 conducts the fluid tothe pressure'pump.

To facilitate stopping the spindle 2 when a wheel is to be removed, abrake-drum 72 lis secured lto the spindle-2 with which cooperates abrake hand 72 connected in thev i variable speed electric motor, any ofthe methods by which the speed is altered, such as the introduction ofresistances in the shunt field circuit in such manner as to allow athezc'lrai'n is-'c'onnected Yto a downwardly exztendmgnarm 7S secured`to the saddle 35, and

as the saddle moves along its ways, there is a `corresponding movementin the lower reach 'of' the chai-n, thus turning lthe rheostat with theeffect that there will ybe an increase or decrease :inthe speed ofrotation of the spindle 2 in Aproportion to the size of the wheel.

In operation, the wheel lto be trued is placed `on the spindle '2, andthe tool :is shifted to either of its angular positions, after which itisc'lamped in place lby admitting pressure to the lower end of the`cylinder 39. By manipulating the proper valves, the tool, bymovementsfofthe slide and saddle, is brought near the edge of the wheel,and if `there is not, in the judgment of `the operator, too great anamount of Amateriali to be removed, 'the'shim is interposed by swingingit to place before't'he boss 57, the screw 56 being turned inwardlyuntil the hub 59 contacts the shim, .after which lthe proper valve ismanipulated to-exert the full pressure lof the cylinder 50 on the screw56, holding the saddle firmly in-:this position. The cutting operationis then performed by moving the tool-carrying slide towardthe'centerofthe wheel, and after the desired degree of cut has vbeen made, furthermovement -of th-e slide is arrested by gplacing the proper valve in ytheneutral position. The valve controlling the lsaddle movement is thenreversed to move the tool from lthe wheel a suflicient distance, whenthe :slide-is lagain moved in the original direction, the tool howevernot clearing lthe wheel during this movement.

W'hen the slide has progressed well beyond rthe Vuncut edge of `thewheel, Ithe pressure-on the tool-holder is relieved, the tool is shiftedto the opposite angular position and again clamped. The slide is thenmoved to carry the `I,tool against the wheel, Vcontinuing until theremainder of the rough periphery receives the `initial cut. If the wheelis now near the desired hize, the saddle is moved to relievethe'pressure on the shim, after which it islifted away, and the saddleagain moved to thestop afforded bythe Contact of hub and boss whenafcu-tequal to the thickness of the shim is taken similar tothe mannerdescribed.

Having thus described our invention, we claim:

r1. In a machineof the character described, a rotatable spindle tosupport and rotate an abrasive wheel, asupporting member, .a tool andVits holder mounted on said member, means for moving said member towardsaid wheel to adjust the cutting position of said tool with relation tosaid wheel, electric molrio tor speed .controlling devices,and,aconnectionbetween vsaid movablesupport and said devices. i i 2. In amachineof the character described, `a rotatable spindle to support androtate and rotate an abrasive wheel, amovable supporting4 member, vatooland its holder mounted on .said supporting member, means for movingsaid member toward said wheel to adjust the tool with relation to saidwheel, a controlling rheostat, a connection between said rheostat andsaid movable supporting member.

y 3. ln a machineof the character described,

a rotatable spindleto support and rotate an vabrasive wheel, a movablesupporting member-,'ateol and its holder mounted on said supportingmember, means for moving said v member .toward said wheel to adjustthe'tool l with relation to said wheel, a controlling rheostat, aconnection between said rheostat and said movable supporting member,said -connection consisting of. a sprocket on the i port and rotate anabrasive wheel, a tool sup-Y port movable in a fixed direction withrespect to said spindle, a tool 'holder and tool adjust ably mounted onsaid support to permitthe tool 'to be'positioned in opposite uniformangular Vrelation with they sides of said wheel, and means for `clampingthe holder to 'said support in either position of adjustment, said meansincluding a iiuid pressure cylinder and piston rod carried` by saidsupport, a clamp and a Vconnection between said piston rod and clamp.A

5. In an apparatus'of the character described, a rotatable spindleladapted to support and rotate an abrasive wheel, a movable support, atool holder and I tool swivelly mounted on said support whereby the toolmay be positioned in opposite uniform angullarrelation 'with the sidesof said Wheel, means for accurately positioning the tool ineitherdirection, and means Jfor clamping the holder to said supportincluding a 'luidpressure cylinder and its Vpiston and a pivotedclamping lever allcarriedbysaid support, one end of saidlever 'having aconnection with the piston of said cylinder and the other end of saidlever adapted to exertpressure on said holder. v

I 6. In an apparatus of the character ydescribed,"a rotatable spindleadapted to support and rotate an abrasive wheel, a tool support movablein a iiiied direction with respect to said spindle,.atoel holder andtool adjustably mounted on saidsupport to permit the toolrfto bevpositioned in opposite uniform angular relation with the sides or" saidwheel, j

means for clamping the holder tosaid support in eitherV position'ofadjustment',y said `.mea-ns including a Huid pressure cylinder andpiston rod carried' by lsaid support, and a pivoted clamping'lever, oneend 4Voit-,which is Inv testimony whereof, we have hereunto set ourhands this 15th day ofl May 1929, HERMON. e. vvniNLANia-vr vGEORGE E.VANCExI

